oh yeah range does do these things don't it

nice :)

Here's what I gather: l has 3 occurrences; the rest of the characters, including the space, each have 2 occurrences, so they stay in their positions (tie).

Please explain the second example, as it's not clear (for me, at least)

'Hello He worldwrd' --> 'lllHeo He wordwrd' (not 'lllHHeeoo  wwrrdd')

• Why are all ls together in the first word, and not in the 1st and 3rd?
• Why does the o stay in the 3rd word of the output, if the l in the same word moved to the 1st?
• If they should all appear at the first appearance, why is there a separate He in the output?
• Why the multiple ws and ds are not grouped in the 3rd word of the output?

to be clear, this is not the best solution as it uses O(n^2 log n) time; Blind4Basics solution is better.

Approved

^^ what johnny said

python new test framework is required. updated in this fork

Python: Random tests are vulnerable to input modification.

Python new test framework should be used (Refer this for more detail)

Oh, I totally forgot that range can do this.

And once more elegant one-liner!
Bravo!

Python new test framework should be used (Refer this for more detail)